Surely that will depend on what type of proshell? I've not even seen that Mammut jacket but I have now reviewed two heavy duty Marmot neoshell jackets and liked both of them but they're winter jackets to my mind - too heavy and bulky to carry that much.

In reply to BnB:Im not slating it ,its robust and fits well but it feels like the old bergaus exrteme 3 layer gtx old version,so i imagine BnB is right in that its suited to alpine summer/winter at high altitude.

In reply to Siward:Im glad you like them,i have the berghaus extreme trango 3 layer jacket size large would you like to buy it,i have got used to the softer fabric of proshell,the old goretex feels too cumbersome now,hence the manufacturers are making better lighter jackets now.